Now that I'm getting more serious about purchasing a XR650R, I'm hearing conflicting stories about registering a new bike in California. I've heard that if I buy a 49 state XR, then I can't register it in California or get a green sticker. What's the thruth behind this? What's so different about the California XR650R's? Are they just more congested/detuned than the 49 state XR's (exhaust restriction & carb settings)? Is there a list of differences posted somewhere?